Saudi Arabia’s Crown Prince Mohammed bin Salman will meet US President Donald Trump at the White House on Tuesday, cementing a burgeoning relationship that the oil-rich kingdom says will advance peace and stability in the Middle East.

MBS, as the de facto ruler of Saudi Arabia is known, arrived in Washington on Monday — a rare venture for the 40-year-old royal outside his home region. He’s accompanied by a delegation of officials and aides numbering nearly a thousand, according to people with knowledge of preparations for the visit.